Machine tool, particularly milling machine having a counter support



Feb. 11, 1936. R. STUHLMACHER 0,

MACHINE TOOL, PARTICULARLY MILLING MACHINE HAVING A COUNTER SUPPORT Filed Au 12; 1952 Fig.2

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Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE MACHINE TOOL, PARTICULARLY MILLING MACHINE HAVING A COUNTER SUPPORT Richard Stuhlmacher, Siegmar, near Chemnitz, Germany, assignor to Wanderer-Werke vorm. Winklhofer & Jaenicke Akt.-Ges., Schonau- Ohemnitz, Germany Application August 12, 1932, Serial No. 628,602 In Germany September 7, 1931 6 Claims. (01'. -205) did not provide for a secure performance in that they did not provide for a complete and unyielding shock absorption, they were braced at their ends with-movable or rigid scissor-like levers or column connecting members. These scissor-like levers or column connecting members are under many conditions and instances a hindrance in attending to and observing the machine or work which is being produced.

The purpose of the present invention is to do away with the scissor-like levers or column connections at the forward end of the counter support. This is essentially attained in that the counter support is braced and held rigid with the vertical frame of the machine, that is, side braces or bracing members are provided.

The drawing shows a preferred form of the invention, in which,

Figure 1 is an end view of the milling machine,

Fig. 2 is a side view of the milling machine,

Fig. 3 is a top view of the machine,

Fig. 4 is a section through a detail, and

Fig. 5 is a top view of a modified construction of the bracing members.

The counter support or overarm I of the milling machine is provided at its forward end with guiding tracks or channels 2 and 3 arranged on each side thereof and which are formed in any suitable manner. At the upper end of the Vertical frame column or standard 4 of the machine and adjacent to the counter support I there is provided on each side similar guiding tracks or channels 5 and 6 which are likewise provided and constructed in any suitable and desired manner. As shown in Fig. 1 there is provided a bracing member I and 8 on each side of the counter support I and each bracing member is provided or maintained at one end in the track 2 or 3 of the counter support I and at the other end in the track 5 or 6 of the frame column 4. The side braces I and 8 must be capable of extreme rigidity so that its form will not or cannot be changed and for that reason it is preferable that such braces are T or U-shaped in cross section and for further rigidity and strengthening suitable flanges and ribs preferably in a zig-zag formation may be provided. Also the braces I and 8 may be constructed in a lattice formation.

The tracks or channels with which the end of the braces I and 8 cooperate must permit a horizontal movement or adjustment of the counter support I in its direction of length. It is sufiicient for this purpose that one of the two sets of tracks or channels 2 and 3 or 5 and 6 be constructed or formed as a sliding or slotted guide.

In order to attain a sure bracing operation,

means are provided by which the ends of the bracing members I and 8 can be securely clamped in their guides or tracks 2 and 5 and 3 and. 6.

In preparing large and bulky work-pieces such as to be treated by a cutting-head it might be necessary to entirely move back the counter support I. The braces I and 8 in that case cannot remain in their original positions. If in such cases they are to be entirely removed and then they must have as low a weight as possible, for this purpose they may be provided with cut-out portions.

The braces I and 8 can also be connected by means of a linkage or a hinge to the upright frame 4 so that when moving the counter support I to its entire rear position it will be necessary merely to fold back the braces I and 8.

The connection in one of the two tracks or channels can also be made absolutely rigid and permanent, or it can be so constructed that only at extremely odd times will it be necessary to remove or loosen the braces, particularly when there is the necessity to completely move back the counter support which is seldom necessary. It can in that case for instance be regidly connected to the forward end of the counter support and the other end may be provided in tracks or channels which are arranged as horizontal slots.

In the construction shown for example on the drawing the two guiding slots or channels 2 and 3 and 5 and 6, arranged at right angles to one another, are arranged as T-shaped grooves in which the guide member 9 of the braces I and 8 slide. The rigid clamping in this case is carried out by means of screws I0. However, par ticularly in the case of mortice-shaped or dovetailed grooves, the clamping can be carried out by rotating the screws I0 and thus rigidly provide the clamping means in the slots or grooves. In order to attain as perfect a sliding contact and as sure a clamping connection as possible, it may be necessary to provide as many and as large a contacting surface or surfaces as possible, in such manner that either the guiding channels or the slots in the column 4 for the counter support I are arranged in a suitable manner to grip the braces i and 8 or vice versa. This is particularly of importance when the rear slots 5 and 6 for the side braces I and 8 are arranged as separate side columns which have a cross section to provide for sufficient rigidity. In general it might be necessary that these slots or guides are made of one piece with the column and in such a manner that the guiding slots 5 and 6 extend laterally from the column 4 in order to increase the polar moment of inertia of the cross section of the column and thereby to provide the column with rigidity against turning under the milling stresses acting at a greater or lesser leverage.

I claim as my invention:

1. A machine tool, particularly a milling machine, comprising a machine standard, an overarm arranged on and exclusively fastened to the standard, the main part of the overarm projecting freely from the standard, a working spindle, means for supporting the working spindle, said means being arranged at the projecting part of the overarm, and lateral bracing arms, each in one piece, directly connected at one end to the sides of the projecting part of the overarm and. at the other end to the standard.

2. A machine tool, according to claim 1, in which the bracing arms are connected at one end to the overarm by clamping means and at the other end to the standard by means of an arrangement so that the bracing arms may be pivotally swung out of position after loosening the clamping means.

3. A machine tool, according to claim 1, in which the bracing arms are connected at one end to the standard by clamping means and at the other end to the overarm by means of an arrangement so that the bracing arms may be pivotally swung out of position after loosening the clamping means.

4. A machine tool, according to claim 1, in which the overarm is movable on the standard, and guides are provided for connecting the bracing arms to the overarm and to the standard for enabling the overarm to be moved in its longitudinal direction with the bracing arms attached 5. A machine tool, particularly a milling machine, comprising a machine standard, an overarm arranged on and projecting freely from the standard, lateral bracing arms, the free projecting part of the overarm being supported on the standard by means of the lateral bracing arms, and vertical guide projections at the sides of the standard to increase the rigidity of the standard and to support and guide the lateral bracing arms.

6. A machine tool, particularly a milling machine, comprising a machine standard, an overarm arranged on and projecting freely from the standard, lateral bracing arms, the free projecting part of the overarm being sup-ported by means of the lateral bracing arms, and vertical guide tracks removably connected to the standard to support and guide the lateral bracing arms.

RICHARD STUHLMACHER. 

